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【判断题】
任何被 IgG结合的靶细胞均可被K细胞非特异性的杀伤。A.
正确
B.
错误
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举一反三
【单选题】—What was onthe table an hour ago? —There ______ some bread on it.
A.
is
B.
are
C.
was
D.
were
【简答题】Seat belts are also called ________.
【简答题】We welcome you aboard the Eastern Flight and will do our best to make your trip comfortable and enjoyable. For your safety and convenience To begin the trip, we would like to draw your attention to so...
【简答题】We welcome you aboard the Eastern Flight and will do our best to make your trip comfortable and enjoyable. For your safety and convenience To begin the trip, we would like to draw your attention to so...
【单选题】Advocates of seat belts on school buses―many of them are parents and medical organisations―argue that seat belts are necessary not only to reduce fatality and injury, but also to teach children lesson...
A.
The use of seat belts can stop the death and injury .
B.
Seat belts can help children realize the importance of using them in moving vehicles.
C.
Seat belts can teach children lessons about the importance of keeping away from drivers.
【多选题】二极管的基本原理 说法正确的是
A.
当 PN 结外加正向电压（正向偏置）时，在外电路上则形成自 P 区流入而从 N 区流出的电流，称为正向电流 IF ，这就是 PN 结的正向导通状态。
B.
当 PN 结外加反向电压时（反向偏置）时，反向偏置的 PN 结表现为高阻态，几乎没有电流流过，被称为反向截止状态。
C.
二极管只要击穿，必然会被烧毁。
D.
PN 结具有一定的反向耐压能力，但当施加的反向电压过大，反向电流将会急剧增大，破坏 PN 结反向偏置为截止的工作状态，这就叫反向击穿。
【简答题】We welcome you aboard the Eastern Flight and will do our best to make your trip comfortable and enjoyable. For your safety and convenience To begin the trip, we would like to draw your attention to so...
【简答题】Task 3 We welcome you aboard the Eastern Flight and will do our best to make your trip comfortable and enjoyable. For your safety and convenience To begin the trip, we would like to draw your attentio...
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